I always fly spirit and from my experience it's alright. No beverage on flight (whatso ever). Be sure to only take backpack-only one (don't end up paying $100/bag at check-in). You can check in small luggages $35/bag before 24  hrs of the flight (if it is later than that, they charge you $40 or $50 a bag). When you sign up for their newsletter (via email) and be a clubmember ( paying $59 annually) you can get deals starting from $29 (of course for shorter flights like dallas to houston, still other domestic flights could be often times less than $70-80 one way). Recommended only if you are light traveler. Be @ airport 2 hours before the flight leave because they will not put you on next flight and you will end up paying for the second flight.